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Below the 690 apartments—not to mention the gyms, bars, dry cleaners and movie theater—that make up the 15-acre Linked Hybrid residential complex in Beijing, China, are 660 geothermal wells that eliminate the need for air conditioners and boilers. Each well funnels water 325 feet beneath the ground into bedrock, where the constant 55ºF temperature either heats or cools it before it’s pumped back to the surface and piped through the building’s concrete floors. The system will reduce energy costs by up to 30 percent in the summer and up to 40 percent in the winter. stevenholl.com
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